Malicious PDF — malware analysis report

Static analysis result for SHA-256 9af0a75541acc221…

MALICIOUS

PDF

81.3 KB Created: 2021-09-17 18:50:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8012d0889d57d6506c7f0a765586bc87 SHA-1: 5ca36b489f5a5fcc544153c4a3c5d88e90e74fda SHA-256: 9af0a75541acc221c777a68c805c02113fc2da777f9af91a4d679ec3d2a5f5d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan-like behavior. The heuristics reveal it functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites. While no scripts were directly extracted, the nature of link farms and the presence of embedded URLs suggest an intent to redirect users to malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pirkitpadangas.lt/ckfinder/userfiles/files/texowewojazum.pdf In PDF document text
    • http://frutapacargentina.com/ckfinder/userfiles/files/jibarelalesolagujiriroxi.pdfIn PDF document text
    • https://frisch.ro/files/file/bapuwonakewu.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/55965678130.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161362011d9584---57873828712.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1dcda4542---jufefadojaga.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/63588328982.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161329a765a0fe---50522377885.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/kexagasevufas.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/xokugo.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/pugokazodejipadeje.pdfIn PDF document text
    • http://cuacuonbinhduong.com/upload/files/55945136731.pdfIn PDF document text
    • https://ristovski.mk/public_html/upload/userfiles/file/kesegekafadifosoduzoludex.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144a5ac5fafe---karazobotewuwevipawom.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/rabanoziziramod.pdfIn PDF document text
    • http://hladonural.ru/upload_picture/gaxakopotikofenosatefoxev.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/3346168580.pdfIn PDF document text
    • http://devveb.net/userfiles/file/23809213001.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/xonademabosojedana.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/31581610417.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/powogeturut.pdfIn PDF document text
    • https://estoniapools.com/contents/files/27968664440.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/76988570654.pdfIn PDF document text
    • http://chuaphucluong.com/uploads/image/files/94319874285.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=gps+terbaik+di+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C4 18068 bytes
SHA-256: c7d159654a7b165835f64fe8d535ce4c9a14cb09a657da62a69b4e1d253b9124
font_01_sfnt_off00010736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10736 10608 bytes
SHA-256: e567d5b1331c78acab90443151fd35a91965b5889488d66262f017f2de6bdad2
font_02_sfnt_off00011f64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.